$BAD4/47828: Overflow / Underflow
Jump from $E00B:
BAD4: A5 66 LDA $66 ; FAC Sign
BAD6: 49 FF EOR #$FF
BAD8: 30 05 BMI $BADF
Jump from $BAB9, $BAC4:
BADA: 68 PLA
BADB: 68 PLA
BADC: 4C F7 B8 JMP $B8F7 ; Perform Addition
Jump from $BAD8, $BAC0, $BAEB, $BAF6, $BB23:
BADF: 4C 7E B9 JMP $B97E ; Output ?OVERFLOW Error
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